Hydraulic brake.



H. JUNKERS.

HYDRAULIC BRAKE.

APPLICATION mm APR. 15, 1914.

Patented May 29, 1912.

2 SHEET$-SHEET I.

lv z'irzesses 7720 112 0).-

H. JUNKERS.

HYDRAULIC BRAKE.

APPLICATION FILED APR. 15, I914- 2 SHEETS-SHEET 2.

Patented May 29,1917.

nueo witxnns, or AACHEN, GERMANY.

mrmmumc BRAKE.

Specification of Letters Patent.

Application filed Apri115, 1914. Serial no, ss2 12s.

' To all/whom it may concern:

Be it known that I, HUGO JUNKERS, a subject of the German Emperor, residing at Aachen, Frankenburg, in the Kingdom of Prussia, Empire of Germany, have in vented certain new and useful Improvements in Hydraulic Brakes, of which the following is a specification.

This invention relates to hydraulic brakes or measuring devices for use in measuring the amount of power developed gine and consisting of a rotor adapted to be coupled to the engine and a stator forming w1th the rotor an inclosed space for the reception of the braking medium. The invention involves the provision of a plurality of pins mounted upon the rotor 'and stator and projecting therefrom into the space occupied by the liquid; Preferably, the pins on the rotor and the pins on the stator are arranged in line so that the several groups of pins lie in planes rotor opposite the spaces between the rows of pins on the stator. By reason of the provision of such pins upon the rotor and stator, a relativel large amount of resistance to the rotation of the rotor is developed, the liquid in the space between the rotor and stator is evenly distributed, the retardation is not wholly dependent upon the friction between the liquid and the surface of the container therefor, and the ap- 4 paratus may be employed in measuring the power output "of engines operatingat relatively low s of wear incident to the use of the apparatus is very small and as the pins may expand freel the water may reach a relatlvel high temperature without injuriously a fecting the parts. of the The preferred embodiment of the inven apparatus.

tion is illustrated in the accompanying drawings, 'in which Figures sectional views, transverse and parallel to the axis of rotation, respectively; Fig. 3 is a view corresponding toFig. 2' and illustrating a modification; Fig. 4 is a view v be employed; and Figs. 5, 6and 7 are diashowing various shapes of pins which may .grammatic views illustrating the apparatus which may be employed to. indicate the amount of the braking effect Referring to the drawings, a isthe-rotor by an ena liquid which constitutes transverse to the axis of rotatlon with the rows of pins on the eed. Furthermore, the amount 1 and 2 are.

secured upon the shaft e. The stator b is in the form of a casing surroundingv the Patented May 29, 1917.

rotor a and provided with bearings through 1 which the shaft e extends. .A plurality of radially disposed pins are mounted upon the rotor a, as shown at 0. These pins are ar ranged in one or more rows circumferen- 1 tially about the rotor at, three such rows being shown in, Fig. 2. A plurality of pins alaremounted'upon the interior surface of the stator 6, these pins 03 being also ar-..

ranged in rows circumferentially about the axls of rotation, and the rows of pins d being opposite the spaces between the rows of p ns 0 upon the rotor. Water is admitted to the space be ween the rotor and stator by pipe 7 controlled by a valve k and the outlet for the heated water consists of a pipe 9 provided with a valve 2'. By suitably adjusting the valves h and i, the amount of water or other liquid within the casing 11, and consequently the magnitude ofthe braking effect, may be regulated as desired.

If desired, the several pins 0. and a may be arranged parallel to the axis of rotation in the manner shown in Fig. 3, the pins 0 projecting laterally from one face of the rotor a and the in the other direction from the opposite wallof the casing b.

pins at extending laterally The pins 0 and d may be of any cross sec-- I tional shape desired, as is indicated in Fig. 4, wherein the pins on the rotor are shaded while those on the stator are shown in outline. It Will be noted that all of the pins on the rotor and stator are in the form of studs or columns and that they arefree from reentrant surfaces such as would be present on a pin which is convex on one side and concave on the other. Preferably, all of the pins are synnnetrical with respect to the line of extension ofthe row, as, for instance, by making all of the pins circular or'square in cross-section.

of the braking device so that the rotor at is pins of that.

throughthe spaces between the rows of pins the ,fixed pins and the latter cause the liquid to be thrown back into the path ofmoved on the stator, they throw the liquid against 100 The shaft of the engine to be tested is con- .nected in any suitablemanner to the shaft 6' curately gaged.

liquid is made to whirl about, causing the development of a large amount of friction and the transformation of energy intoheat. No effort is made to give direction to the movement of the liquid so that it is unnecessary that the several pins be accurately finished or that their relative positions be ac- As the apparatus may be operated in either direction, it is specially adapted for 1 means may be employed for measuring the amount of its movement effected against a sultable resistance.

i may be employed for this purpose are illustrated in Figs. 5, 6 and 7. In Fig. 5, a lever Z is shown secured at one end to the shell or casing b of the couple and having its opposite end adapted to press upon a scale m, the beam of which carries a pan on which selected weights may be placed. In Fig. 6, the casing 72 has a band or rope is aflixed thereto and the'opposite end of this band or rope is connected by a spring n to a fixed support. The amountof movementof the casing 72 and band It is indicated by a suitable index moving over a scale in the manner shown. In Fig. 7, the casing I) is shown as provided with a "projection 10 to which one end of a torsion rod is fastened, the other end of the rod being secured to a fixed support 9. With this construction, the movement of the casing b is accompanied by a torsional strain of the rod 0 and its extent isindicated by an index 8 mounted on a tubular extension 1' of the projection 39 and coacting with a scale t.

What I 'c1aim is: 1. A hydraullc testing apparatus comprising the combination of a rotor and a Gonstructions which 1 stator, one mounted within the other and providing space for a liquid between them, and a plurality of pins mounted-on the rotor and stator at distributed points and projecting therefrom into the space in which the liquid is received, the "pins on the rotor being shaped to throw the liquid against the pins on the stator and these pins on the stator being shaped 'to'throw back the liquid against said pins on the rotor; substantially as described. 7

2. A hydraulic testing apparatus comprising the combination of a rotor and a stator, one mounted within the other and providing space between them for a liquid,

and a plurality of pins upon the rotor and statorprojecting into the space for the liquid, the pins being arranged in rows about the axis of rotation and the rows of pins on the rotor being opposite the spaces between the rows of pins on the stator, the pins of each row 'on the rotor havinga cross-section symmetrical on both sides of the line of extension of the row; substantially as described. Y

3. A hydraulic testing apparatus comprising the combination of a rotor-and a stator, one mounted within the other and providing a space between them for a liquid, and a plurality of pins upon the rotor and stator projecting into the space for the liquid, the rows of pins on the rotor being opposite the spaces between the rows of pins on the stator, the pins of each row on the stator having cross-sections symmetrical on both sides of the line of extension of the row; substantially as described. I

4. A hydraulic testing apparatus comprising the combination of arotor and a stator, one mounted within the other and providing a space between them for a liquid, and a plurality of pins upon the rotor and stator projecting into the space for the liquid, the rows of pins on the rotor being opposite the spaces between the rows of pins on the stator, the pins of the rows on both the rotor and the stator having a cross-section. symmetrical on both sides of the line of extension of the row; substantially as described.

5. A hydraulic testing apparatus comprising the combination of a rotor adapted to be connected to the engine to be tested,

a casing surrounding-the rotor and providing a space for a liquid between it and the rotor, and a plurality of pins mounted at distributed points projecting outwardly from the rotor and inwardly from thecasing, the pins in the form of columns free from rentrant surfaces and being arranged in rows about the axis of rotation with the rows of pins on the rotor opposite the spaces (j between the rows of pins on the casing.

HUGO JUNURS.

In testimony whereof I afiix my signature Witnesses:

Lunwie WAenNsnm, ALFRED MILLER. 

